Film dielectric capacitors have been widely used in high-power electronic equipment. The design of microstructure and the choice of fillers play an important role in nanocomposites' energy storage density. Machine learning methods can classify and summarise the limited data and then explore the promising composite structure. In this work, a dataset has been established, which contained a large amount

In order to achieve rapid and simple non-destructive testing of water trees in materials, a novel water tree characterisation method based on the complementary split ring resonators (CSRR) was proposed. The characteristics of circular CSRR and rectangular CSRR were analysed in high-frequency electromagnetic simulation software. The resonant frequency of CSRR was found to be correlated to the dielectric

Developing green insulation materials has become an important direction for future research. As a new environmental insulation liquid, natural ester can effectively delay cellulose insulation polymer ageing. Mastering the mechanism of natural ester delaying the cellulose ageing could promote its application in power transformers. In this study, based on the accelerated thermal ageing of pressboard

In this study, the implementation of different corona discharge models in a transient program for overhead multiconductor lines based on the implicit Crank-Nicolson Finite Difference Time Domain method is presented. Among different corona models available in the literature, two empirical models (Gary's and Suliciu's models) and a physics-based model (Malik's model) are discussed, which are broadly

In order to adapt to the development of electronic devices, it is necessary to improve the thermal conductivity and breakdown strength of composites. Boron nitride (BN) is an ideal candidate material with high breakdown strength and thermal conductivity. Therefore, the introduction of BN nanosheets into the polyvinylidene fluoride (PVDF) matrix can improve the thermal conductivity and breakdown strength

In a modular multilevel converter-based high-voltage direct current (MMC-HVDC) system, the dc fault ride through (FRT) control is an effective way to deal with a dc-side pole-to-ground (PTG) fault. However, the setting of FRT duration brings potential hazards: 1) MMC will face the risk of “secondary short circuit” if FRT duration is short; 2) ac grid may have power angle stability issue if FRT duration

The insulated gate bipolar transistor (IGBT) is one of the most fragile components in power electronics converters. In order to improve the reliability of IGBTs, various measurements are taken according to the condition monitoring (CM) technique. Traditional CM techniques include the measurement and estimation of the device operation conditions. Recently, emerging techniques have been developed, not

The polarization information contained in the frequency-domain spectroscopy (FDS) could be utilised for characterising the ageing degree of transformer oil-immersed insulation. However, the polarization information will be obscured by its conductance effect, it is thus hard to analyse the polarization behaviour by using the traditional FDS technique. Given this issue, an alternative approach is proposed

This work reports the effect of octavinyl polyhedral oligomeric silsesquioxane (OvPOSS) on tuning the electrical performance of polypropylene (PP). OvPOSS with different content are introduced into PP using the solution method. The microstructural morphology, crystallinity behaviour, breakdown strength, DC conductivity, space charge formation, and trapping level distribution are measured. The results

Temperature is an important environmental factor during the operation of gas-insulated switchgear (GIS), affecting the evaluation results of the GIS equipment to increase the risk of the power system. However, the influence of temperature on the partial discharge detection signal of GIS is still unclear. Aimed at the common void defects in GIS, the law of change on the number of ultrahigh-frequency

Sulphur hexafluoride (SF6) is widely used in gas insulation, and its decomposition products can be used to diagnose potential insulation failures. Quick and accurate detection of decomposition products can help to understand equipment-operating conditions in time. In this study, the decomposition products of SF6/air gas mixtures under different pulsed discharge voltages were studied. It was found that

In this study, conductive polyaniline (PANI) ribbons were introduced to a semiconductive layer to improve the conductivity stability of the layer during thermal expansion and enhance its ability to inhibit charge injection into the insulating layer. To maximise the effect of PANI, PANI and carbon black (CB) were preformed into a uniformly dispersed composite, which was then added to the polymer matrix

The large leakage current of the roof arrester caused by the high-frequency resonant overvoltage on the high-speed train occurs intermittently, which will cause the arrester to overheat locally. In this work, the overheating issue of the arrester under Ultra Harmonics Overvoltage is studied. Then, the relationship between the active power and the voltage (including amplitude and frequency) of the arrester

Nowadays, end fitting corrosion reduces the mechanical strength and flashover voltage of insulators, forming a huge threat to high-voltage direct current transmission lines. At present, the parameters of electrolytic corrosion inhibition measures are selected based on the premise of the constant annual corrosion rate. However, with the development of corrosion, corrosion products accumulate on the

Online monitoring of gases dissolved in transformer oil is widely applied. Improving the performance of dissolved gas analysis (DGA)-based fault diagnosis methods by exploring new features of time-series data has become an appealing topic. In this study, a new type of correlation features between characteristic gases was extracted from time-series data based on the maximal information coefficient (MIC)

As one of the major concerns of climate change, identifying a proper eco-friendly insulation gas for replacing sulphur hexafluoride (SF6) becomes a prominent research topic in recent years. c-C4F8, CF3I, C5F10O, C6F12O and C4F7N are some potential alternatives that are proved to have excellent characteristics, including high insulation strengths and low Global Warming Potentials (GWPs). Beyond these

In order to ensure the safe operation of submarine cables, it is of great significance to analyse the insulation state of submarine cables from the perspectives of microstructure, carrier transport characteristics and macroscopic dielectric properties. In this study, based on the high-voltage frequency domain spectroscopy (HV-FDS) measurement system, HV-FDS experiments of fresh and thermally aged submarine

Hybrid circuit breakers (CBs) are the most promising technology to isolate DC faults in modular multilevel converter (MMC)-based DC grids. However, they consist of expensive power electronic components that are sensitive to high overvoltage and overcurrent. This study proposes a hybrid high-voltage DC circuit breaker with an energy absorption branch of a parallel arrester structure, and investigates

The convolutional neural network (CNN) achieves excellent performance in pattern recognition owing to its powerful automatic feature extraction capability and outstanding classification performance. However, the actual samples obtained are unbalanced, and accurate diagnoses are difficult for the existing methods. A classification method for partial discharge (PD) pattern recognition in gas-insulated

Hollow porcelain insulators in substations are frequently confronted with rain flashovers under extreme rainfall. This study aims to investigate the spatial and temporal variation of electric fields between hollow porcelain insulator sheds affected by dynamic deformation of pendant water drops and effects of the dimensionless number of fluids, the Weber number (We) and the electric Bond number (BoE)

Rheumatoid arthritis (RA) is an autoimmune disease of the joints characterised by synovial hyperplasia and chronic inflammation. Rheumatoid arthritis fibroblast-like synoviocytes (RA-FLS) cells are the dominant cell type in the hyperplastic synovial membrane, which play a key role in the pathogenesis of RA. They can invade cartilage, cause inflammation, destroy joints, and show tumour-like anti-apoptosis

To improve the pollutant removal efficiency by non-thermal plasma (NTP), the effect of H2O vapor and O2 on removal efficiency of NO and SO2 as well as the reduction of CO was investigated in H2O/O2/SO2/NO/C3H6/CO2/N2 system. To analyse the reaction mechanism, the effects of H2O vapor and O2 on the emission intensity of O ( 3 p 5 P → 3 s 5 S 2 0 ) and O H ( A 2 ∑ + → X 2 ∏ ) were investigated. The experimental

Considering the long length of gas-insulated transmission lines (GILs), novel methods are required to alleviate the impacts of axial diffusion on decomposition products' monitoring. The diffusion process of two typical decomposition products, SO2 and SO2F2, was studied. During the diffusion experiments, SO2 and SO2F2 were generated by partial discharges. Based on Fick’s law, an axial diffusion model

With the development of DC power transmission and distribution technology, power equipment such as converter transformers, DC cables, and DC gas-insulated equipment has been widely used in the power grid. In addition, with the growing attention of hybrid and all-electric vehicles including electric aircraft and electric ship in commercial transportation and military industry, the stability of the propulsion

Measuring partial discharges in DC insulation systems is an issue due to the lack of a reference relating the voltage waveform to the physics of discharge phenomena. Also, DC is not always steady state, due to voltage and load transients that generate electric field profile variations inside an insulation system, which can affect partial discharge inception likelihood and characteristics. Partial discharge

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I n the years that led to the deployment of 5G networks, people often read of the envisioned transformative power of 5G in everyday life, with examples usually drawn from health care, entertainment, and automation. As explored in this column, these promises are finally coming to fruition as more trials and near-commercial deployments showcase the capabilities of 5G in these areas. At the same time

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The vehicle of the future is expected to be automated. High levels of vehicle automation are seen as enabling technologies to improve road safety and road utilization and to reduce air pollutant emissions. However, to make this happen, research communities still need to address several challenges. Vehicle automation requires information about the surrounding environment, road conditions, and vehicle

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Contemporary transportation is developing toward applications of large-capacity vehicles. This trend is caused mainly by environmental and economic factors. In the public transportation area, it leads to the use of long and articulated electric buses, which are difficult to maneuver, even for experienced drivers. Consequently, there is a need to develop advanced driver-assistance systems (ADAS) for

Fifth-generation (5G) cellular networks enable many vehicular communication applications by providing wireless interfaces for the exchange of messages among vehicles [vehicle to vehicle (V2V)] and among vehicles and pedestrians, infrastructure components, and application servers [vehicle to everything (V2X)]. Platoon networked control systems to maintain intervehicle distance (IVD) represent one of

This article presents a framework to model and design the longitudinal motion control (LMC) system for electric vehicles (EVs). Thanks to the passivity property of EVs, a hierarchical control configuration including three layers is proposed. In the lower layer, each actuator is provided a disturbance observer (DOB) for locally preventing the wheel slip. A global controller is designed in the upper

Advanced air mobility (AAM) aims at shifting a major part of today’s ground-based urban transportation of people and goods into the third (vertical) dimension. Aerial transport routes lead to shorter transport times and relieve ground traffic. Opening up the third dimension for transport in densely populated urban areas requires reliable and alwaysavailable communication to coordinate the multitude

Research for 6th generation (6G) communication currently focuses on nonterrestrial networks (NTNs) to promote ubiquitous and ultrahigh-capacity global connectivity. Specifically, multilayered hierarchical networks, i.e., the orchestration among different aerial/space platforms, including low-altitude platforms (LAPs), high-altitude platforms (HAPs), and satellites cooperating at different altitudes

Airborne radar carried on board unmanned aerial vehicles (UAVs) is serving as the harbinger of new remote sensing applications for security and rescue in inclement environments. The mobility and agility of UAVs, along with intelligent onboard sensors (cameras, acoustics, and radar), are more effective during the early stages of disaster response. The ability of radars to penetrate through objects and

The COVID-19 pandemic is still holding the world in a stranglehold. Large-scale vaccination is in different stages throughout nations globally, and countries that have come far in terms of vaccinating the population are slowly beginning to open up. The commercial vehicle industry sells more vehicles than it can produce for the moment—a sort of rebound effect from when the world was put on hold last

Reports on the events and activities to take place during the IEEE VTS Motor Vehicles Challenge which will focus on combining energy management and component sizing multiobjective optimization problems for a multisource EV (see Figure 2). The participants will design the hybridization of a battery and supercapacitor based on commercial vehicle and cell models. Then, they will develop the realtime EMS

The IEEE 802.15 Working Group on Wireless Specialty Networks is a working group of the IEEE 802 LAN/ MAN Standards Committee of the IEEE Computer Society. It is chartered to develop interoperability standards addressing wireless networking for emerging Internet of Things applications. Among the many standards the working group has been developing, IEEE 802.15.4, IEEE Standard for LowRate Wireless Networks

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In the BCD loop of Fig. 1 on page 3487 of the above-named article (ibid., vol. 35, no. 5, pp. 3481–3493, Sep. 2020, doi: 10.1109/TPWRS.2020.2977405) is considered. The commentor states that the arrow from the BCD second sub-problem is required to go to the step of v = v + 1 to check for next value of v in place of BCD first sub-problem.

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The papers in this special section focus on resilience-oriented protection control and monitoring systems for power grids. Existing protection and control systems have been developed based on the properties and requirements of the legacy power system. However, the severity, frequency, and diversity of large-scale disturbances that can disrupt normal operation of power grids have increased. For instance

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